The ABC Notation plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'abcjs' shortcode in all versions up to, and including, 6.1.3 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
The ABC Notation plugin for WordPress is vulnerable to Path Traversal in all versions up to, and including, 6.1.3 via the 'file' attribute of the 'abcjs' shortcode. This makes it possible for authenticated attackers, with Contributor-level access and above, to read the contents of arbitrary files on the server, which can contain sensitive information.